Table 1 Scoring system for identification of histologic lesions by H&E staining

0^a

None

1^b

Focal granulomatous inflammation (lamina propria or subcortical sinus, cortex only)

2^c

Multifocal to coalescing granulomatous inflammation (lamina propria or subcortical sinus or cortex only)

3

Coalescing/diffuse granulomatous inflammation (lamina propria, subcortical sinus, cortex)

4^d

Coalescing/diffuse granulomatous inflammation (extending into submucosa or medulla)

5

Coalescing/diffuse lesions extending deeply into submucosa ± lymphangitis